Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

RN = hl/k

RN = μ cp/k

RN = ρ V l /μ

RN = V²/t.cp

RN = hl/k

RN = μ cp/k

RN = ρ V l /μ

RN = V²/t.cp

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Heat and Mass Transfer
In counter flow heat exchangers

One fluid is in hottest state and other in coldest state at inlet

Both the fluids at inlet are in their hottest state

Both the fluids at exit are in their hottest state

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

One fluid is in hottest state and other in coldest state at inlet

Both the fluids at inlet are in their hottest state

Both the fluids at exit are in their hottest state

Both the fluids at inlet (of heat exchanger where hot fluid enters) are in their coldest state

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Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Either (A) or (B)

Both (A) and (B)

Directly proportional to the surface area

Directly proportional to the difference of temperatures between the two bodies

Either (A) or (B)

Both (A) and (B)

Directly proportional to the surface area

Directly proportional to the difference of temperatures between the two bodies

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Heat and Mass Transfer
Total heat is the heat required to

Change vapour into liquid

Increase the temperature of a liquid or vapour

Change liquid into vapour

Convert water into steam and superheat it

Change vapour into liquid

Increase the temperature of a liquid or vapour

Change liquid into vapour

Convert water into steam and superheat it

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Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Does not affect the intervening medium

Move actually

Do not move actually

Affect the intervening medium

Does not affect the intervening medium

Move actually

Do not move actually

Affect the intervening medium

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Heat and Mass Transfer
The emissivity for a black body is

0.5

0.75

1

0.5

0.75

1

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Heat and Mass Transfer

Heat and Mass Transfer Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer In counter flow heat exchangers

Heat and Mass Transfer According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer Total heat is the heat required to

Heat and Mass Transfer The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer The emissivity for a black body is

Heat and Mass Transfer
Reynolds number (RN) is given by (where h = Film coefficient, l = Linear dimension, V = Velocity of fluid, k = Thermal conductivity, t = Temperature, ρ = Density of fluid, cp = Specific heat at constant pressure, and μ = Coefficient of absolute viscosity)

Heat and Mass Transfer
In counter flow heat exchangers

Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Heat and Mass Transfer
Total heat is the heat required to

Heat and Mass Transfer
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body

Heat and Mass Transfer
The emissivity for a black body is